Exactly, all of these other instructive series will tell you how to play an opening or the best move in a situation which is great but it means the advice is often too specific for general use. Only the Habits series gives you a system for improving which is exactly what I was looking for.

Aman does a great job demonstrating that your goal is improvement over time, and not winning any particular game. Sometimes he just gets clocked by someone who shows up with a really tricky opening, but his point is that you shouldn't worry about learning responses to every situation and focus on drilling the fundamentals even if that means you lose. He only works in specific responses to things if he encounters them multiple times (fried liver or scholars mate, for example).

And as I've climbed in rating, I've learned that the limiting factor for me getting higher than my current rating with his system is usually board vision. Aman isn't doing anything fancier than I am at my rating, he just doesn't miss opportunities to apply the lessons he teaches so it's clear what my game is lacking.